Welcome to JOF
Could you clarify the model of Jayco referenced, I can't seem to locate a "14SO".
I would first check your owners manual in the Towing section, check for any towing restrictions (i.e.; WDH's, etc.). Some vehicles do to frame design are not conducive to WDH usage. Also, please note that a WDH (Weight Distribution Hitch) isn't a sway device, it's main function is to distribute weight.
If you are inquiring about anti-sway devices, then yes, I would recommend the use of a sway control device with every RV trailer.
Please confirm the new Jayco model number, it will help with responses.
Thanks in advance.
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)